06 WR450 tapping noise

21 replies to this topic
  • grayracer513

Posted January 21, 2009 - 09:50 AM


I want to know if you looked inside the cylinder and could see the piston when it was at TDC when you set your valves. I always take a rubber hose and make sure I'm not at BDC. The valves are closed at both and it would be easy to make a mistake.

Not true.

The exhaust valve opens at around 60-70 degrees BEFORE BDC as the piston travels down on the power stroke, and remains open until around 30-40 degrees ATDC as the intake stroke is beginning. The intake valve opens at around 30-40 degrees BTDC as the exhaust stroke is ending, and stays open until about 60-70 degrees AFTER BDC as the compression stroke begins. Thus, there is no BDC in the 4 stroke cycle at which one valve is not open.

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  • NorthCarolinaNick

Posted April 25, 2009 - 07:21 PM


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Just to let you guys know, I bent the cam chain (#4) and part #9 while adjusting my valves by turning the crank the wrong way :banghead: This is what was causing the tapping noise. $500 bucks to have dealership tear it down and replace bad parts.


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